Scalable content rendering

ABSTRACT

The presently disclosed subject matter includes a computer-implemented system and method for receiving content from another computer device and dynamically adapting display of the received content within a container of a formatted document, the container defining a restricted area within the formatted document designated for displaying the content. Sub-elements within at least one content item are identified and tagged, the tagging enables to acquire display parameters of tagged sub-elements and calculate therefor a required adaptation of the content item such that it can be fitted within the respective container.

This application claims priority from provisional application No.62/344,077 filed on 1 Jun. 2016 which is incorporated herein byreference in its entirety.

FIELD OF THE PRESENTLY DISCLOSED SUBJECT MATTER

The presently disclosed subject matter relates to the field offormatting and displaying digital content.

BACKGROUND

Digital content is usually sent from a content source or server, to beconsumed in a client or another machine or location. A browser (e.g. webbrowser) is a software application that consists of numerous softwarecomponents, which process digital content of various types (normallyincluding information resources identified by uniform resourceidentifier or locator), together with a set of internal (i.e. definedlocally by the browser) and external (i.e. defined by entities otherthan the browser such as the content source, the operating system, thehost device, etc.) directives and constraints, and eventually decideshow exactly the content should be laid out and eventually displayed on adisplay device of a certain host computer, under those specificcircumstances. Examples of browsers include Google Chrome, InternetExplorer, Opera, Safari, and others.

FIG. 1 is a schematic illustration of an example of a webpage layout.Webpage 100 displays multiple visual containers, some of thesecontainers assigned with a certain restricted area for displayingrespective content items. Containers 110 and 120 display a menu andnavigation bar, container 130 displays the title, and container 140displays contents of an article. In addition, the webpage example showsfour different recommendation widgets 150, 160, 170 and 180, eachcomprising in turn a number of inner visual containers (including e.g.151, 152, 153, 161, etc.) for displaying recommendations for webpageviewers. A recommendation can include a suggested clickable alternativeinformation resource.

GENERAL DESCRIPTION

A browser handles an abundance of input parameters, including code,instructions, directives, constraints, and content of various types, ina dynamic real-time environment. For example, in the case of textrendering, such browser input parameters include, inter alia: type ofhost device, size of display screen, size of display window, size ofcontent (e.g. word count), available fonts, word-spacing,letter-spacing, word-breaking, hyphenation, other font metrics, specificJavaScript and cascade styling sheet (CSS) instructions received from acontent source, etc.

Due to the abundance of these parameters as well as the dynamicreal-time environment (resulting, inter alia, from the fact that many ofthese parameters are only taken into account by the browser in real-timeduring the rendering process), in a lot of cases it is practicallyimpossible to predict in advance the precise manner in which the contentwould be eventually rendered and displayed on display device of aspecific host computer.

Some variations in displayed content result from differences in theoperating system which is being used (e.g. the same “Helvetica” font mayhave a different implementation in a Windows operating system vs. in aMacintosh operating system), other variations from differences in theinstalled software packages and yet others from differences in hardwareconfiguration (e.g. in the same type of device), or from other real-timeconditions (e.g. whether or not a certain font is available forretrieval from a third-party server during the rending process), mayresult.

Consequently, the exact size of a container assigned for displayingcertain text and/or the specific area which is required for displayingthe text may not be known until the webpage has been rendered. Forexample, if some style directive of a webpage, which is being renderedat a host computer, assumes a specific font should be used for aspecific textual content, but that specific font is not available forsome reason on the browser software at that time, then the browser mayselect, in real-time, a different font from the ones which areavailable, and use it to display the textual content. As furtherdemonstrated with reference to FIG. 2 below, selection of font type inreal-time can affect the way the text is rendered on the display, and inparticular can affect the size of the specific area which is required todisplay that certain text.

Ultimately, such real-time decisions may affect various visual aspectsof the overall rendered page. For example, selection of alternativefonts by the browser, with metrics larger than the metrics of theoriginally intended fonts, may result in an increase in the arearequired for displaying a certain textual content, leading to an“overflow” of the text outside its designated container, oralternatively “pushing” other content to be displayed further below thanoriginally intended. On the other hand, selection of alternative fontswith metrics smaller than metrics of the originally intended fonts mayresult in leaving a large empty space within the designated container,unlike the originally intended result, and further degrading theappearance of the page and the overall user experience.

One example of this problem is related to the rendering of multiplelines of text within a restricted designated container, referred toherein below as the “multiline clamping problem”. As mentioned abovewith respect to FIG. 1, text in a webpage is many times displayed withina restricted area of a container designated for that purpose. Each suchcontainer (e.g. in a respective recommendation widget) has a predefineddisplay area that has been allocated for it, and the relevant text canonly be displayed within this area.

Therefore, at least from the point of view of the overall userexperience, it is often required or expected that during rendering of awebpage, where “multiline clamping problems” occur, text designated tobe displayed in a certain container may be truncated, or “clamped”, bythe browser of the host computer so it fits the area of the respectivecontainer. In some cases, when such clamping occurs, the browser furtheradds a visual indication (e.g. an ellipsis character “ . . . ”) toindicate to a webpage viewer that the text has been truncated.

According to some existing approaches for handling the “multilineclamping problem”, the text is truncated at the server before it is sentto the browser to be rendered in a specific manner, with the intentionthat after this truncation the text would be rendered by the browser ina way that is intelligible, aesthetic and appealing to eye. However, dueto the dynamic real-time environment in which the browser operates, manytimes a text truncated by the server is eventually rendered by thebrowser in a way that is aesthetically degraded, unappealing andsometimes unintelligible (e.g. due to text overflow from the designatedcontainer).

FIG. 2 is a schematic illustration of an example of two differentlayouts of the same recommendations widget, which demonstrates how thisapproach may fail. It is noted that the example shown in FIG. 2 isnon-limiting and recommendations can include various combinations ofcomponents including one or more of: images, videos, text, etc. FIG. 2shows widget 210 and widget 220, each comprising three containers fortextual content. Widget 210 shows the texts rendered as originallyintended by the server (see 212, 214, 216), and widget 220 shows thesame texts as they were actually rendered and displayed (see 222, 224,226) by a browser at a host computer under the constraints resultingfrom the specific dynamic real-time environment of the browser.

For example, a specific font family and font size may be selected at theserver side with the intention that the text would fit into exactly twovisual lines within the container. However, since the selected font isnot available at the browser in real-time (e.g. the font was notinstalled or otherwise unavailable at time of webpage rendering) thebrowser selects, in real-time, an alternative font, resulting in thetext rendered as shown in widget 220.

Notice for example, containers 214 and 224, where the same text thatoriginally intended to fit into two visual lines now spans more than twovisual lines. The text in in 224 ends after one word in the third visualline, leaving the rest of line empty, which is different than theoriginally intended visual outcome.

Notice further containers 212 and 222. In container 212 the ellipsischaracter (“ . . . ”) at the end of the second visual line indicates tothe reader that the original sentence was longer, but was truncatedafter the word “Act . . . ”, because there is evidently no room todisplay the rest of the words in the original sentence. Indeed, thistruncation was done in advance by the server, expecting the visualresult shown in container 212. In container 222, the same truncated textthat was provided by the server spans across three visual lines, and theellipsis character “ . . . ” appears in the middle of the third visualline after the word “Act”. This results in a degraded user experience asit is not clear to the user why no more words of the sentence appearwhere there is evidently more room to show them.

According to other existing approaches, the rendering of the originaltext is performed by the browser at the host computer, which determinesin real-time if and how the text should be rendered and possiblytruncated. FIG. 3 is a schematic illustration demonstrating suchapproaches.

Container 310 includes certain text rendered according to some textualstyling requirements that include rendering the text over three visiblelines within the container. Container 320 includes the text which wasactually rendered by the browser under the constraints imposed by thebrowser's real-time dynamic environment. Note that unlike the stylingshown in container 310, here the text is bounded by the area of thecontainer and thus only the part of the text which fits within the firsttwo lines of the container is visible. Namely, part of the textincluding the words “full guide you must read” is omitted, and the textabruptly terminates with the word “The”, with no visual indication thatthe displayed text is a truncated version of a longer text, and thus maydegrade user experience. In contrast, a more desired user experience canbe achieved by adding a visual indication (e.g. ellipsis) to indicatethat the original text was truncated, as illustrated in container 330.

Another problem that can arise from the real-time decisions made by thebrowser during execution of the rendering process is demonstrated incontainer 350. The original text that required four visual lines (asshown in container 340) has been constrained, due to the size of thecontainer, to only three visible lines. The truncation of text incontainer 350 inadvertently resulted in text truncated in the middle ofthe word “title” (leading to potentially offensive language).

Some of the existing approaches, which intend to handle the “multilineclamping problem” provide a solution which is limited only to specificcases e.g. applicable only in a certain type of browser, applicable onlyin a specific configuration, or assume that the background of the textis always of some specific color, etc.

Some of the existing approaches, which enable to better control how acontent is rendered by the browser and truncate the text to fit moreaccurately within a designated container, consume valuable computerresources (e.g. processing resources, time and memory resources), aconsumption which degrades both computer performance and userexperience, sometimes to the extent that such approaches are no longeracceptable as a valid solution to the problem by the industry, e.g. therequired time resources are unacceptable.

According to one such approach, text overflowing from its container isrepeatedly truncated (e.g. by a single letter or by a whole word) untilit is determined that the truncated text fits its respective container.To this end, the browser is repeatedly queried (e.g. after eachtruncation) to provide measurements of certain visual aspects of therendered texts and their respective containers. These visualmeasurements can be used for determining the location of a text relativeto its designated container and eventually deduce therefrom whether thetext is properly fitted within the boundaries of the container.

However, changes made to the content of a webpage (such as truncation oftext) are likely to invoke a “reflow” (the process of re-rendering andrepainting the webpage to the changes made) computation by the browserin response to subsequent queries for visual measurements. Approachessuch as the above (repeatedly modifying text and querying for visualmeasurements) may lead to a large number of “reflow” computations.

Reflow is a costly process (in terms of computer resources consumption),sometimes effectively involving heavy calculations and the repainting ofthe entire webpage. Repeatedly executing a reflow process after eachtruncation can tremendously degrade both computer performance and userexperience (e.g. resulting in a significant delay in the webpage loadingtime). In addition, it may be required to repeat this process for eachof the “multiline clamping problem” instances in the webpage, e.g. foreach of the containers in each of the widgets in a webpage, until allthe texts are fitted within their respective containers. This repetitiveprocess increases even further computer resources consumption as well asthe total rendering time of the webpage.

The presently disclosed subject matter includes a computer system and acomputer implemented method that allow to better understand the relationbetween content and the manner in which it is rendered, therebyincreasing control over the manner in which content is being rendered ata host device (e.g. by a browser) in a performant, responsive andscalable manner, notwithstanding the dynamic real-time environment ofthe browser.

According to one aspect of the presently disclosed subject matter thereis provided a computer-implemented method for dynamically adaptingdisplay of content within a container of a formatted document, thecontainer defining a restricted area within the formatted documentdesignated for displaying the content, the method comprising:

using one or more computer processors for executing a content renderingprocess (e.g. by a browser), comprising:

identifying sub-elements within at least one content item, the at leastone content item is assigned to be displayed within a respectivecontainer in a formatted document; tagging at least some of thesub-elements to thereby obtain a plurality of tagged sub-elements of theat least one content item; wherein the tagging enables to obtain displayparameters of tagged sub-elements (e.g. from the browser); displaying atleast some of the tagged sub-elements of the content item in therespective container in the formatted document; determining displayparameters of at least some of the tagged sub-elements; calculating,based on at least the display parameters, whether at least onesub-element overflows from an area designated for displaying content inthe respective container; in case at least one sub-element overflows therespective container: adapting the at least one content item to fit inthe area; and displaying the adapted at least one content item withinthe area of the container in the formatted document.

Additional to the above features, the method according to this aspect ofthe presently disclosed subject matter can optionally comprise one ormore of features (i) to (xi) below, mutatis mutandis, in any technicallypossible combination or permutation.

-   -   i) wherein, in case at least one sub-element overflows the        respective container, an increase in the number of overflowing        sub-elements does not require an increase in the number of        displaying operations.    -   ii) wherein the at least one content item includes textual        content and the tagged sub-elements include tagged textual        sub-elements.    -   iii) wherein the calculating whether at least one sub-element        overflows the respective container comprises:        -   determining, based on the display parameters, position of at            least one tagged sub-element with respect to the area            designated for displaying content in the respective            container; and determining whether the position is            indicative of an overflow of the at least one sub-element            outside the boundaries of the area.    -   iv) wherein the calculating whether at least one sub-element        overflows the respective container comprises one or more of (1)        and (2):        -   1)            -   (a) determining the height and width of the tagged                textual sub-element;            -   (b) determining the height and width of the respective                container;            -   (c) determining based on (a) and (b) whether at least                one sub-element overflows the respective container;        -   2)            -   (a) determining the offset of at least one tagged                textual sub-element relative to the respective                container;            -   (b) determining the height of the respective container;            -   (c) determining based on (a) and (b) whether at least                one sub-element overflows the respective container.    -   v) wherein the adapting the at least one content item to fit in        the respective container, comprises identifying a last visible        line of the at least one content item; and modifying the last        visible line in the container to include a new textual element;        the new textual element is configured to be displayed in a        single line, such that it is truncated in case of a text        overflow.    -   vi) wherein the adapting the at least one content item to fit in        the respective container, comprises, removing a plurality of        tagged textual sub-elements such that the remaining textual        sub-elements fit within the area; and adding a visual indication        that the plurality of tagged textual sub-elements were removed.    -   vii) wherein the adapting further comprises adding one or more        characters designated for indicating to a viewer of the document        that sub-elements have been truncated.    -   viii) wherein the at least one content item includes a plurality        of content items each assigned to be displayed in a plurality of        respective containers in the formatted document and wherein, in        case at least one content item overflowed the respective        container, an increase in the number of content items does not        require an increase in the number of displaying operations.    -   ix) wherein the tagging at least part of the sub-elements        comprises: wrapping each one of sub-elements with an HTML tag to        thereby transform the sub-element into a Document Object Model        element.    -   x) The method further comprises, in response to a change in one        or more display environment characteristics, automatically        repeating the content rendering process to thereby adapt the        content item to fit within the respective container.    -   xi) The method further comprising: monitoring display        environment characteristics, including at least size of window        assigned for displaying the formatted document, dimensions of        window assigned for displaying the formatted document, size of        the respective container, and dimensions of the container.

According to another aspect of the presently disclosed subject matterthere is provided a computer-implemented system comprising: at least onecomputer device configured for receiving content from another computerdevice and dynamically adapting display of the received content within acontainer of a formatted document, the container defining a restrictedarea within the formatted document designated for displaying thecontent, the computer device comprising a processing circuitryconfigured to:

identifying sub-elements within at least one content item, the at leastone content item is assigned to be displayed within a respectivecontainer in a formatted document; tagging at least part of thesub-elements to thereby obtain a plurality of tagged sub-elements of theat least one content item; wherein the tagging enables to obtain displayparameters of tagged sub-elements; displaying at least part of thetagged sub-elements of the content item in the respective container inthe formatted document; determining display parameters of at least partof the tagged sub-elements; calculating, based on at least the displayparameters, whether at least one sub-element overflows from an areadesignated for displaying content in the respective container; in caseat least one sub-element overflows the respective container: adaptingthe at least one content item to fit in the area; and displaying theadapted at least one content item within the area of the container inthe formatted document.

According to another aspect of the presently disclosed subject matterthere is provided a non-transitory program storage device readable by acomputer, tangibly embodying computer readable instructions executableby the computer to perform a computer-implemented method of fordynamically adapting display of content within a container of aformatted document, the container defining a restricted area within theformatted document designated for displaying the content, the methodcomprising:

obtaining data indicative of sub-elements within at least one contentitem, the at least one content item is assigned to be displayed within arespective container in a formatted document, the sub-elementscomprising a plurality of tagged sub-elements; wherein tagging ofsub-elements enables to obtain display parameters of taggedsub-elements;

displaying at least part of the tagged sub-elements of the content itemin the respective container in the formatted document; determiningdisplay parameters of at least part of the tagged sub-elements;calculating, based on at least the display parameters, whether at leastone sub-element overflows from an area designated for displaying contentin the respective container; in case at least one sub-element overflowsthe respective container: adapting the at least one content item to fitin the area; and displaying the adapted at least one content item withinthe area of the container in the formatted document.

The presently disclosed subject matter further contemplates a userdevice configured for executing the operations of the method disclosedabove.

The system, the computer storage device and the user device disclosed inaccordance with the presently disclosed subject matter can optionallycomprise one or more of features (i) to (xi) listed above, mutatismutandis, in any technically possible combination or permutation.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to understand the presently disclosed subject matter and to seehow it may be carried out in practice, the subject matter will now bedescribed, by way of non-limiting examples only, with reference to theaccompanying drawings, in which:

FIG. 1 is a schematic illustration of a webpage example;

FIG. 2 is a schematic illustration of an example of two manners in whicha recommendation widget may be rendered;

FIG. 3 is a schematic illustration of different examples demonstratingresults of real-time rendering by the browser.

FIG. 4 is a schematic illustration of a block diagram of a general viewof a computer system, in accordance with some examples of the presentlydisclosed subject matter;

FIG. 5 is a schematic illustration of a more detailed view of somecomponents of FIG. 4, in accordance with some examples of the presentlydisclosed subject matter;

FIG. 6 is a flowchart showing operations carried out in accordance withsome examples of the presently disclosed subject matter; and

FIGS. 7a, 7b and 7c are schematic illustrations demonstrating someprinciples of the method described with reference to FIG. 6, inaccordance with some examples of the presently disclosed subject matter.

DETAILED DESCRIPTION

Elements in the drawings are not necessarily drawn to scale. Unlessspecifically stated otherwise, as apparent from the followingdiscussions, it is appreciated that throughout the specificationdiscussions utilizing terms such as “identifying”, “tagging”,“displaying”, “calculating”, “adapting”, “executing” or the like,include actions and/or processes of a computer that manipulate and/ortransform data into other data, said data represented as physicalquantities, e.g. such as electronic quantities, and/or said datarepresenting the physical objects.

The terms “computer”, “computer device”, “computerized device”,“computer system”, or variation thereof should be expansively construedto include any kind of electronic device with a processing circuitrycapable of data processing and which includes one or more computerprocessors operatively connected to a computer memory (optionallyincluding non-transitory computer memory) operating together forexecuting and/or generating instructions. Examples of such a deviceinclude: digital signal processor (DSP), a microcontroller, a fieldprogrammable gate array (FPGA), an application specific integratedcircuit (ASIC), a personal computer, server computer device, otherdedicated processing device, etc.

As used herein, the phrase “for example,” “such as”, “for instance” andvariants thereof describe non-limiting embodiments of the presentlydisclosed subject matter. Reference in the specification to “one case”,“some cases”, “other cases” or variants thereof means that a particularfeature, structure or characteristic described in connection with theembodiment(s) is included in at least one embodiment of the presentlydisclosed subject matter. Thus the appearance of the phrase “one case”,“some cases”, “other cases” or variants thereof does not necessarilyrefer to the same embodiment(s).

It is appreciated that certain features of the presently disclosedsubject matter, which are, for clarity, described in the context ofseparate embodiments, may also be provided in combination in a singleembodiment. Conversely, various features of the presently disclosedsubject matter, which are, for brevity, described in the context of asingle embodiment, may also be provided separately or in any suitablesub-combination.

In embodiments of the presently disclosed subject matter, fewer, moreand/or different stages than those shown in FIG. 6 may be executed. Alsothe order of execution of the described operations should not be limitedto the order which is presented in the figures.

FIGS. 4 and 5 illustrate general schematic diagrams of the systemfunctional in accordance with an embodiment of the presently disclosedsubject matter. The components in FIGS. 4 and 5 may be centralized inone location or dispersed over more than one location. In otherembodiments of the presently disclosed subject matter, the system maycomprise fewer, more, and/or different modules than those shown in FIGS.4 and 5. For example, while server computer 450 is illustrated as asingle computer device, in other examples it may be implemented asseveral interconnected computer devices distributed at differentlocations (e.g. some onboard the aircraft and some located elsewhere).

The term “performant” as used herein should be broadly construed toinclude the efficient usage of computers' resources (including CPU,memory, disk resources etc.), as well as time resources. For example, awebsite owner may not use a third-party JavaScript code if it imposes aperformance overhead, such as causing the web page to be displayed aftermore than a certain time (e.g. 500 milliseconds), or consuming too muchmemory, or too high CPU resources.

The term “responsive” or “responsiveness” as used herein, should bebroadly construed to include applicability to different displayenvironments as well as to changes (in real-time) in displayenvironment. The term “display environment” is used to include variousparameters which characterize the display of content in a computerdevice including, but not limited to: size or dimensions of displayscreen, size or dimensions of display windows or containers, displayscreen resolution, etc.

The term “scalable” or “scalability” as used herein, should be broadlyconstrued to the capability to handle a growing amount of work, or thepotential to accommodate that growth.

Bearing the above in mind, attention is now drawn to FIG. 4 which showsa schematic illustration of a block diagram of a general view of acomputer system according to some examples of the presently disclosedsubject matter. System 400 shown in FIG. 4 is a general example whichdemonstrates some principles of the presently disclosed subject matterand should not be construed as limiting in any way.

System 400 comprises a number of computer devices connected over acommunication network. In the illustrated example, system 400 comprisesuser device 410, Content Server 450 and Content Model Server 460.Communication between different computer devices in system 400 can befacilitated over one or more types of communication networks 480. Forexample communication networks can include any one of: the Internet,local area network (LAN), wide area network (WAN), metropolitan areanetwork (MAN), various types of telephone networks (including forexample PSTN with DSL technology) or mobile networks (including forexample GSM, GPRS, CDMA etc.), or any combination thereof. Communicationwithin the network can be realized through any suitable connection(including wired or wireless) and communication technology or standard(WiFi, 3G, LTE, etc). The various computer devices in system 400 areoperable to communicate over the network communication links.

User device 410 represents a viewing entity consuming content providedby Content Server 450. User device 410 can be any computer device (e.g.PC, laptop, Smartphone, notepad, etc.) comprising, inter alia, aprocessing circuitry (e.g. including one or more computer processors 414operatively connected to a computer memory 412), a communicationinfrastructure for facilitating communication with other computerdevices, and display device 490 (e.g. LED display device, e.g. viadisplay adapter 422). User device 410 further comprises various computerprograms 416 executable by the processing circuitry. Computer programsinclude, but are not limited to, one or more operating systems and aclient agent configured to manage communication between user device 410and another computer device inter-connected by communication network480. According to some examples, client agent can be implemented as webbrowser 420.

According to some examples of the presently disclosed subject matter,web browser 420 further comprises Content Monitoring Engine 430, whichis received (or updated) at the user device 410 in real-time andincludes data and computer instructions to be executed by the browser.

Content Server 450 represents one or more server computer devicesconfigured to provide content to other computer devices (such as userdevice 410). In some cases, content is provided to a computer device byContent Server 450 in response to a request issued by the computerdevice. Such requests can possibly include one or more of: details onthe user (e.g. cookies, IP address, user credentials), the device (useragent information, browser configuration, fonts installed, defaultlanguage, etc.) and context (URL, request parameters, e.g. keywords,etc.).

Content Server 450 is operatively connected to one or more data storageunits implementing a content database 452 for storing the relevantcontent. The stored content can include any type of Internet contentavailable today such as web objects (text, graphics and scripts),downloadable objects (media files, software, documents), applications(e-commerce, portals), etc. The content provided by Content Server 450is presented on a display device of the receiving computer device, in aformatted document such as a web page document, the formats includingfor example: news website format, email message format, newsletterformat, etc. One example of Content Server 450 is a web serverconfigured to process and respond to HTTP requests. Other examples ofContent Server 120 include mail servers, video streaming servers, etc.Herein below the term web page is used by way of non-limiting example,however the presently disclosed subject matter contemplates other typesof formatted documents and therefore the term “web page” should not beconstrued as limiting.

Content Model Server 460 represents one or more server computer devicesconfigured to provide content to other computer devices. In someexamples, the data received from Content Server 450 at a user device 410includes instructions to the user device (e.g. via web browser 420) toaccess Content Model Server 460, and obtain therefrom additionalcontent. In other examples, Content Server 450 requests additionalcontent from Content Model Server 460 and provides a response to userdevice 410, which includes the content received from Content ModelServer 460.

Additional content can include for example, content which is displayedat the user device 410 in addition to the content provided by ContentServer 450. Additional content can include for example, recommendations,advertisements or other content and in some cases may be related torequested content, or to some other characteristics of the viewer, userdevice or context.

When preparing the response (received from either a user device orcontent server) Content Model Server 460 can optionally use informationfrom internal or external databases (462 and 463) storing datacharacterizing one or more of: the user, the user device and therequested content, and generate a response which is customized orpersonalized based on this information. In some implementations ContentModel Server 460 sends the response to Content Server 450, which in turnsends content, optionally together with code and/or configuration, touser device 410. In other implementations Content Model Server 460 sendsthe response directly to user device 410.

Browser 420 at user device 410 receives the content originating fromContent Server 450 and the additional content originating from ContentModel Server 460. The data received at the user device 410 includes, inaddition to the content, also auxiliary data such as webpage formattinginstructions (e.g. CSS, fonts, etc.) and various JavaScript codes forexecution by the browser. Rendering Engine 440 processes the content andformatting information and renders the content according to theformatting instructions e.g. in a webpage format. Once rendered, userdevice 410 displays the rendered content on the display device 490. Asmentioned above, a schematic illustration of a webpage layout is shownwith reference to FIG. 1.

Notably, any one of the computer devices described above can bedistributed over more than one device. For example, Content Model Server460 can be distributed over a number of server devices all owned by thesame entity and/or different devices can be owned by different entities,each providing different alternative content. Furthermore, while in theexample above Content Server 450 and Content Model Server 460 aredescribed as separate entities, in some cases both types of content canbe provided by the same entity.

FIG. 5 is schematic illustration of a more detailed view of some of thecomponents shown in FIG. 4, in accordance with some examples of thepresently disclosed subject matter. The functionality of some componentsis described below with reference to operations described in FIG. 6.

FIG. 6 is a flowchart of operations carried out during a contentrendering process, in accordance with some examples of the presentlydisclosed subject matter. Operations described with reference to FIG. 6(as well as 8 below) can be executed for example by system 400 describedabove with reference to FIG. 4 and FIG. 5. However, it is noted that thespecific configuration of elements in system 400 (and specifically thosedepicted with respect to user device 410) is merely a non-limitingexample and various modifications and alternatives to the system can beapplied for executing the described operations.

As mentioned above, data is transmitted to user device 410 by ContentServer 450 and possibly also by Content Model Server 460. According tosome examples, the received data includes the primary content (e.g.content of a requested webpage) and additional content (e.g.advertisements and/or recommendations of alternative content) as well asauxiliary data as disclosed above.

According to the presently disclosed subject matter, Content MonitoringEngine 430 is also provided to the user device (e.g. by Serving Module461 in Content Model Server 460). Content Monitoring Engine 430 includesadditional processing instructions (e.g. in the form of JavaScript code)which are executed (e.g. by the browser) in real-time, as part of theweb page rendering process and enables to increase control over themanner in which content is being rendered at the user device 410, in aperformant, responsive and scalable manner. In some cases where ContentMonitoring Engine 430 has already been previously received at the userdevice, updated instructions may be received from Content Model Server460.

The content received at the user device is processed by the browser,which determines how to render the content on the display device.Assuming the received content (including either one of the primarycontent and additional content) contains one or more textual contentitems, according to some examples of the presently disclosed subjectmatter, a preprocessing stage is executed on the textual content items(block 601). According to one example, preprocessing is executed at theuser device, e.g. by preprocessing module 431 in Content MonitoringEngine. According to other examples, part or all of the preprocessingcan be executed at a different computer device e.g. the Content Server450 or Content Model Server 460, prior to sending it to the user device.The phrase “textual content item” is used here to refer to textualcontent assigned to be displayed in a certain container (e.g. in arecommendation widget) in a webpage layout.

During the preprocessing stage (block 601) at least one textual contentitem is processed to identify individual sub-elements (e.g. textualsub-elements such as words and/or characters) in the textual contentitem. To this end Content Monitoring Engine 430 can be configured toparse the textual content item, and tokenize the text into individualsub-elements.

Further, as part of the preprocessing, the individual sub-elements aretagged to obtain a plurality of tagged sub-elements of the textualcontent item; wherein the tagging of sub-elements enables to query thebrowser in order to obtain display parameters characterizing a specifictagged sub-element. For example, assuming a tagged sub-element is asingle word, the browser can be queried (e.g. the browser's MeasurementsModule 423, by Content Monitoring Engine 430) to provide information(display parameters) pertaining to the height of the word, width of theword and position of the word relative to its assigned container. Inanother example, measurements may be obtained indirectly from aController Engine 421, which may have direct or indirect access toobtaining such measurements from Measurements Module 423. For example,as mentioned above, in some embodiments Rendering Engine 440, ControllerEngine 421, Display Adapter 422, Measurements Module 423 may becentralized in one logical location or dispersed over more than onelogical location or even different computer devices. In a distributedembodiment, a Controller Engine 421 may be used to consolidatecommunication between different components, and Measurements Module 423may have indirect access to the rendered output generated by RenderingEngine 440.

The obtained measurements, including display parameters characterizingtagged sub-elements, may contain valuable information related to therelation between the original content (e.g. textual content item) andthe exact manner in which the content is eventually displayed at theuser device. In some examples, the user device (e.g. reporting Module433) may consolidate such obtained measurements and send some or all ofthem, possibly after some processing or summarizing, to Content ModelServer 460. These measurements may be sent as newly generated eventsfrom user device 410, or optionally appended to existing user generatedevents (e.g. mouse click, key stroke, mouse hover, etc.), thereby“enriching” them with data related to the relation between the contentand the manner it was displayed. For example, a user event indicating auser has clicked a recommendation including textual description may beenriched to include information on the manner the textual descriptionwas eventually displayed on the user device, e.g. the area the textualdescription consumed, whether there was a text “overflow” etc. Thisinformation can be further used for improving user experience, e.g.selecting a more desirable display of content based on click throughrate metrics.

In some examples, such reported measurements may be consolidated atdatabases 462 and 463. In some examples, reported measurements may beutilized by Learning Engine 467 to better predict how to customizecontent at the server-side to be displayed in an intended manner.Customization Database 463 and Content Database 462 may be adapted intime to include data from Learning Engine 467.

In addition, specific and detailed characteristics of the browser may bedetermined based on measurements obtained from the browser. Thesecharacteristics may be sent by Reporting Module 433 to Content ModelServer 460, to be stored in databases 462 and 463 in a similar way tothe manner described above.

According to one specific example, during preprocessing sub-elements inthe textual content item are transformed into a distinctive DocumentObject Model (DOM) elements. DOM elements are building blocks of thewebpage, and can be manipulated programmatically by the browser. Visiblechanges occurring as a result of this manipulation may then be reflectedwhen the textual content item is displayed. As explained above, bytransforming the sub-elements (e.g. words and/or characters) in the textinto DOM elements, it becomes possible to obtain from the browservarious display characteristics of the sub-elements. Transformation ofthe text into DOM elements includes wrapping each word (or possibly eachcharacter) by some HTML Tag.

FIGS. 7a, 7b and 7c show schematic illustrations which demonstrate theoperations of Content Monitoring Engine 430 on a received textualcontent item, in accordance with some examples of the presentlydisclosed subject matter. Text 701 is the original text of textualcontent item received or otherwise generated at user device 410 andintended to be displayed in a web page layout. Text 710 shows themodified text after it has been tokenized into individual sub-elements(in this case individual words) and tagged with HTML tags to therebytransform the words into DOM elements. Note that the modified text 710,which originally included plain text, now includes <ins> and </ins> HTMLtags that wrap each word in the text. It should be understood that anyusage of <ins> HTML tag, or any other HTML tag disclosed herein ismerely for the sake of illustration and is done so in a non-limitingmanner. In particular, other HTML tags may be used, or alternatively anyother tagging technique which enables obtaining visual measurements forthe tagged sub-elements from a browser.

Reverting to FIG. 6, at block 603 the browser (e.g. by the nativerendering engine 440) executes the rendering process and renders thecontent. This includes inserting the modified textual content item inthe respective container assigned for that purpose (e.g. in arecommendations widget).

FIG. 7a schematically depicts container 722 within widget 720. Note,that the rendered text includes a visible portion 723, which is the partfitted within the area of the assigned container 722 and is visible towebpage viewers, and non-visible portion 724, which is the partoverflowing outside the area of the container and is not visible towebpage viewers.

At block 607 it is determined whether the text overflows outside thearea designated for text in the respective container (e.g. bymanipulation module 432 in content monitoring engine 430). To this enddisplay parameters characterizing the tagged sub-elements are obtainedfrom the browser (block 605). Various methods can be used fordetermining text overflow.

According to one example, display parameters including the height andwidth of the tagged sub-elements of a textual content item aredetermined. For example, to this end manipulation module 432 can querymeasurement module 423 and obtain the height and width of each taggedsub-element. In a similar manner, the height and width of the respectivecontainer assigned for displaying the textual content item isdetermined. From this data, the process of rendering of the sub-elementsin the container can be emulated in memory (in particular, the emulationprocess itself does not affect the web page layout), to determine theprecise position of each of the sub-elements relative to the area of thecontainer. Accordingly it can be determined if one or more sub-elementsare located outside the boundaries of the respective container, i.e.whether an “overflow” has occurred.

According to a second example, position of a tagged sub-element of atextual content item relative to the respective container is determined.For example, to this end manipulation module 432 can query measurementmodule 423 and obtain the position of one or more sub-elements relativeto the respective container. In addition, the height of the respectivecontainer assigned for displaying the textual content item isdetermined. Based on this information, the precise position of eachsub-element relative to the container can be determined, and accordinglyit can be determined if one or more sub-elements are located outside theboundaries of the respective container, i.e. whether an “overflow” hasoccurred. For example, assuming it is determined that the top of thelast sub-element (e.g. last word) is positioned 80 pixels lower in thewebpage in relation to the top of the respective container, and alsothat the container's height is only 60 pixels, it can be deduced that atleast the last word is located outside the boundaries of the respectivecontainer, i.e. an “overflow” has occurred.

Notably the examples above should not be construed as limiting and othermethods for determining whether there is an overflowing sub-element canbe alternatively used.

If it is determined that there is at least one sub-element overflowingoutside the area designated for displaying text in the respectivecontainer, the content item is adapted so it fits within the container.Specific examples of methods for adapting the text of a textual contentitem to make it fit a respective container according to a predefinedformat are disclosed herein below.

At block 611, once the text is modified, at most a single “reflow”operation is executed by the browser (e.g. by the rendering engine 440or by a Rendering Adjustments Engine 424) and the web page layout isdisplayed a second time showing the modifications.

According to one example, for the purpose of adapting the textualcontent item as described above (with reference to block 609), once itis determined that at least one sub-element overflows outside theboundaries of the respective container, the last line of the visibleportion of the rendered text within the container is identified (e.g. bymanipulation module 432 in content monitoring engine 420). Variousapproaches can be applied for identifying the last line.

In some cases, this information is readily available from the previousstages. For example, the last line can be identified based on the datathat was used to determine whether there was an overflow as describedabove (with reference to block 607).

According to another example, the first sub-element (e.g. first word) inthe last line (e.g. sub-element 725 in FIG. 7a ) can be identified bytraversing the tagged sub-elements (e.g. DOM element by DOM element) andfinding the first tagged sub-element whose height offset position,relative to the container, equals (NROWS−1)*LINE_HEIGHT, where:

NROWS=number of visible rows in the container;

LINE_HEIGHT=the height of a tagged sub-element (e.g. obtained from themeasurements module 423);

NROWS can be determined by dividing the container's height byLINE_HEIGHT.

For example, for LINE_HEIGHT=20 pixels and container's height of 60pixels, NROWS=60/20=3, and the first word in the last visible line inthe container is the first tagged sub-element whose height offsetposition, relative to the container, equals (3−1)*20=40 pixels.

One optional way of adapting the content item to fit in the respectivecontainer includes modifying the last visible line in the container toinclude a single DOM element, e.g. a single “div” element. This DOMelement (referred to herein also as “special last line div”) isconfigured to cause the browser to display the DOM element in a singleline, truncated in case of a text overflow, possibly including a visualindication (e.g. an ellipsis “ . . . ”) in case such truncation hasoccurred.

For example, as demonstrated in FIGS. 7a and 7b , all the words from theoriginal text following the word “several” 725, namely the words“several visual lines and even overflow its allocated container” aretaken together and tagged to construct a “special last line div”. Thelatter is inserted into the text 710 before the first tagged sub-elementpositioned in the last visible line, thereby “pushing” some of thetagged sub-elements to the non-visible portion (see 743 of the container742) resulting in the adapted text 730 in FIG. 7b (where the “speciallast line div” is the text wrapper with <div> . . . </div> tags). This“special last line div” is styled using specific CSS stylinginstructions (e.g. the CSS instructions “white-space: nowrap; overflow:hidden; text-overflow: ellipsis;”) that are processed by the browser(e.g. by its rendering engine 440), so it is eventually displayed as asingle line, possibly truncated, and terminated with the ellipsischaracter “ . . . ” in case such truncation occurred (see for example745 in FIG. 7b ). In this way, the adapted text is made to fit in therespective container.

In addition, such a process may include an auxiliary first step ofremoving any “special last line div” occurring already in the text fromprevious executions of the process, and only then proceeding with theother execution steps described above. In this way, the process is“idempotent”, i.e. consecutive executions of the process under the samecircumstances will result in the same visual outcome as the outcomeafter a single execution of it. This may be useful in some situations,e.g. for ensuring general stability of the process execution, or foradapting the process to provide a responsive user experience.

Another way to adapt the content item to fit in the respective containerincludes selectively removing some of the tagged sub-elements from thecontent item in case of an overflow, and possibly adding a visualindication in case such removal has occurred. For example, manipulationmodule 432 can query measurements module 423 and obtain the height andwidth of each tagged sub-element, as well as the height and width of therespective container assigned for displaying the textual content item.From this data, in case it was determined that an “overflow” hadoccurred, the manipulation module 432 may select a subset of the taggedsub-elements to retain in the content item, and remove the rest of thetagged sub-elements that are not in this subset. The subset will bedetermined based on the display parameters obtained from themeasurements module 423, while emulating in memory (in particular, theemulation process itself does not affect the web page layout) theprocess of rendering the tagged sub-elements in the container, therebyensuring the adapted result eventually fits in the respective container.In addition, the emulation calculation may also be configured to leaveenough space to add a visual indication (e.g. an ellipsis “ . . . ”)based on the displayed parameters obtained from the measurements.

For example, the text 710 may be modified by removing the taggedsub-elements corresponding to the words “would”, “fit”, “several”,“visual”, “lines”, “and”, “even”, resulting with the modified text 750in FIG. 7c , in which there is also included a visual indication (<span>. . . </span>) that an overflow has occurred, so that it is eventuallydisplayed as demonstrated in container 762. The removed sub-elements maybe persisted (e.g. stored in (browser-associated) computer memory) andremain available without being visible in the display. This allows torevert and use these sub-elements if needed in the future (for exampleto provide responsiveness or “idempotent” nature of the process).

An example of an approach for determining such a subset of taggedsub-elements to retain in the web page layout includes alternatinglyselecting tagged sub-elements from the beginning and the end of thetext, until the emulation calculation determines that there is no morespace for further tagged sub-elements to be included. For example, ifthere are N tagged sub-elements, then the subset can include: the first(1st) tagged sub-element, the last (Nth) tagged sub-element, the second(2nd) tagged sub-element, the second-to-last ((N−1)th) taggedsub-element, and so on including sub-elements in an alternating way fromthe beginning to the end of the text, until the emulation calculation(without affecting the web page layout during the emulation process,e.g. as it is done in memory) determines that there is no more space forfurther tagged sub-elements to be included.

Another possible alternative to the approach above, in order to maximizethe number of words in the subset in the method described above, isadapted to give higher priority to shorter words over longer words to beincluded in the subset instead of ensuring that the same number of wordsfrom the beginning to the end of the text are chosen.

Another approach for determining that a subset of sub-elements fit in arespective container aims to include, in case an overflow has occurred,a visual indication (such as ellipsis “ . . . ”) in a predeterminedposition relative to the container e.g. a specific row number of thecontainer, for instance, always in the second-to-last row in thecontainer. This can be achieved in a similar manner to that describedabove, by emulating the positioning of individual sub-elements withinthe container, adding the visual indication in the desired location, andcontinuing to place sub-elements in the remaining space (e.g. alwaysincluding a word from the beginning of the text, and a word from the endof the text), until the emulation calculation determines that there isno more space for further tagged sub-elements to be included.

As mentioned above, changes made to the content of a webpage, such asadding a “special last line div”, or otherwise adapting the content itemto fit in the respective container, are likely to invoke at most asingle “reflow” computation by the browser, ultimately resulting in theweb page layout displayed a second time where the textual content fitsinto the container in a desirable and visually appealing manner.

Notably, based on measurements of tagged sub-elements obtained from thebrowser, the presently disclosed subject matter allows adapting thecontent items in a controlled manner, before any reflow operation isexecuted. Accordingly at most a single “reflow” computation (or none, incase no “overflow” occurred on the web page layout) is invoked,regardless of the number of overflowing sub-elements. In particular,this provides a scalable solution, as the approaches disclosed hereinwill require at most a single “reflow” computation (e.g. step 611),regardless of the length of the content items or the number ofoverflowing sub-elements.

According to examples of the presently disclosed subject matter, thesteps 605 and 607 are done together as a single processing stage (620)for all containers in all widgets in the web page, e.g. together for allthe instances of “multiline clamping problem” that need to be handled.

Only upon completion of processing stage 620 on all containers in allwidgets in the web page, the next processing stage 630 is executed, inwhich step 609 is applied on all containers for which an overflow wasdetermined in its respective step 607.

In case there was an overflow in one or more of the containers, step 609is performed across all those overflowing containers. As describedabove, this will lead to a one time change in the web page layout,adapting all content items in the overflowing containers so theyeventually fit their respective containers. Once all changes to thecontainers in the web page are made, a single reflow operation 611 isexecuted. In case there was no overflow in any of the containers in theweb page, step 609 may be skipped, and the reflow at 611 will not beinvoked as there was no change to the web page layout.

This ensures that the reflow 611 is invoked only at most once per page,regardless of the number of sub-elements overflowing in each container,and regardless of the number of containers which include one or moreoverflowing sub-elements in the page. Notably the number of containersin a single page that include overflowing sub-elements can in some casesbe large, thus potentially causing a significant performance setback ifdealt with separately. The presently disclosed approach is thereforescalable, allowing to handle an increasing number of instances of the“multiline clamping problem” without essentially affecting theperformance.

According to some examples of the presently disclosed subject matter,the operations described above with reference to FIG. 6 can be repeatedwhen desired. For example, in response to changes in the size ordimensions of a display (e.g. switching from horizontal view to avertical view), a window (e.g. resizing or maximizing a window) or acontainer (e.g. in case other elements in the web page changed theirsize or dimensions), it may be desired to adapt the web page layout inorder to maintain its appealing and aesthetic appearance in the newcircumstances, providing a responsive user experience. For example, whena window size is changed, the area of a container assigned to displayspecific textual content item may change as well. Thus, it may berequired to repeat the rendering process disclosed hereinabove in orderto fit the text within the newly sized container according to thepredefined requirements.

To this end, responsive monitoring module 434 is configured to receivean indication from the browser of changes in size or dimensions of adisplay, window or container as mentioned above and invoke the executionof the content rendering process in response to such an indication.

Alternatively or additionally, responsive monitoring module 434 can beconfigured to independently determine when changes in size or dimensionsof a display, window or container occur, and invoke the execution of thecontent rendering process if such changes are indeed determined. Forexample, responsive monitoring module 434 can be configured toperiodically query measurements module 423 to obtain the sizes ofcontainers, store the obtained measurements (e.g. in computer memory412), and compare the currently obtained measurements with previouslystored measurements, and determine, based on the comparison, whetherchanges in the size of containers has occurred.

1. A computer-implemented method for dynamically adapting display ofcontent within a container of a formatted document, the containerdefining a restricted area within the formatted document designated fordisplaying the content, the method comprising: using one or morecomputer processors for executing a content rendering process,comprising: identifying sub-elements within at least one content item,the at least one content item is assigned to be displayed within arespective container in a formatted document; tagging at least part ofthe sub-elements to thereby obtain a plurality of tagged sub-elements ofthe at least one content item; wherein the tagging enables to obtaindisplay parameters of tagged sub-elements; displaying at least part ofthe tagged sub-elements of the content item in the respective containerin the formatted document; determining display parameters of at leastsome of the tagged sub-elements; calculating, based on at least thedisplay parameters, whether at least one sub-element overflows from anarea designated for displaying content in the respective container; incase at least one sub-element overflows the respective container:adapting the at least one content item to fit in the area; anddisplaying the adapted at least one content item within the area of thecontainer in the formatted document.
 2. The method of claim 1, wherein,in case at least one sub-element overflows the respective container, anincrease in the number of overflowing sub-elements does not require anincrease in the number of displaying operations.
 3. The method of claim1, wherein the at least one content item includes textual content andthe tagged sub-elements include tagged textual sub-elements.
 4. Themethod of claim 3, wherein the calculating whether at least onesub-element overflows the respective container comprises: determining,based on the display parameters, position of at least one taggedsub-element with respect to the area designated for displaying contentin the respective container; and determining whether the position isindicative of an overflow of the at least one sub-element outside theboundaries of the area.
 5. The method of claim 3, wherein thecalculating whether at least one sub-element overflows the respectivecontainer comprises one or more of (i) and (ii): i) (a) determining theheight and width of the tagged textual sub-element; (b) determining theheight and width of the respective container; (c) determining based on(a) and (b) whether at least one sub-element overflows the respectivecontainer; ii) (a) determining the offset of at least one tagged textualsub-element relative to the respective container; (b) determining theheight of the respective container; (c) determining based on (a) and (b)whether at least one sub-element overflows the respective container. 6.The method of claim 3, wherein the adapting the at least one contentitem to fit in the respective container, comprises: identifying lastvisible line of the at least one content item; and modifying the lastvisible line in the container to include a new textual element; the newtextual element is configured to be displayed in a single line, suchthat it is truncated in case of a text overflow.
 7. The method of claim3, wherein the adapting the at least one content item to fit in therespective container, comprises: removing a plurality of tagged textualsub-elements such that the remaining textual sub-elements fit within anarea; and adding a visual indication that the plurality of taggedtextual sub-elements were removed.
 8. The method of claim 3, wherein theadapting further comprises adding one or more characters designated forindicating to a viewer of the document that sub-elements have beentruncated.
 9. The method of claim 1, wherein the at least one contentitem includes a plurality of content items each assigned to be displayedin a plurality of respective containers in the formatted document andwherein, in case at least one content item overflowed the respectivecontainer, an increase in the number of content items does not requirean increase in the number of displaying operations.
 10. The method ofclaim 1 wherein the tagging at least part of the sub-elements comprises:wrapping each one of sub-elements with an HTML tag to thereby transformthe sub-element into a Document Object Model element.
 11. The method ofclaim 1, further comprising: in response to a change in one or moredisplay environment characteristics, automatically repeating the contentrendering process to thereby adapt the content item to fit within therespective container.
 12. The method of claim 11, further comprising:monitoring display environment characteristics, including at least sizeof window assigned for displaying the formatted document, dimensions ofwindow assigned for displaying the formatted document, size of therespective container, and dimension of the container.
 13. Acomputer-implemented system comprising: at least one computer deviceconfigured for receiving content from another computer device anddynamically adapting display of the received content within a containerof a formatted document, the container defining a restricted area withinthe formatted document designated for displaying the content, thecomputer device comprising a processing circuitry configured for:identifying sub-elements within at least one content item, the at leastone content item is assigned to be displayed within a respectivecontainer in a formatted document; tagging at least part of thesub-elements to thereby obtain a plurality of tagged sub-elements of theat least one content item; wherein the tagging enables to obtain displayparameters of tagged sub-elements; displaying at least part of thetagged sub-elements of the content item in the respective container inthe formatted document; determining display parameters of at least partof the tagged sub-elements; calculating, based on at least the displayparameters, whether at least one sub-element overflows from an areadesignated for displaying content in the respective container; in caseat least one sub-element overflows the respective container: adaptingthe at least one content item to fit in the area; and displaying theadapted at least one content item within the area of the container inthe formatted document.
 14. The system of claim 13, wherein, in case atleast one sub-element overflows the respective container, an increase inthe number of overflowing sub-elements does not require an increase inthe number of displaying operations.
 15. The system of claim 13, whereinthe at least one content item includes textual content and the taggedsub-elements include tagged textual sub-elements.
 16. The system ofclaim 15, wherein the calculating whether at least one sub-elementoverflows the respective container comprises: determining, based on thedisplay parameters, position of at least one tagged sub-element withrespect to the area designated for displaying content in the respectivecontainer; and determining whether the position is indicative of anoverflow of the at least one sub-element outside the boundaries of thearea.
 17. The system of claim 15, wherein the calculating whether atleast one sub-element overflows the respective container comprises oneor more of (i) and (ii): i) (a) determining the height and width of thetagged textual sub-element; (b) determining the height and width of therespective container; (c) determining based on (a) and (b) whether atleast one sub-element overflows the respective container; ii) (a)determining the offset of at least one tagged textual sub-elementrelative to the respective container; (b) determining the height of therespective container; (c) determining based on (a) and (b) whether atleast one sub-element overflows the respective container.
 18. The systemof claim 15, wherein the adapting the at least one content item to fitin the respective container, comprises: identifying last visible line ofthe at least one content item; and modifying the last visible line inthe container to include a new textual element; the new textual elementis configured to be displayed in a single line, such that it istruncated in case of a text overflow.
 19. The system of claim 15,wherein the adapting the at least one content item to fit in therespective container, comprises: removing a plurality of tagged textualsub-elements such that the remaining textual sub-elements fit within anarea; and adding a visual indication that the plurality of taggedtextual sub-elements were removed.
 20. The system of claim 15, whereinthe adapting further comprises adding one or more characters designatedfor indicating to a viewer of the document that sub-elements have beentruncated.
 21. The system of claim 13, wherein the at least one contentitem includes a plurality of content items each assigned to be displayedin a plurality of respective containers in the formatted document andwherein, in case at least one content item overflowed the respectivecontainer, an increase in the number of content items does not requirean increase in the number of displaying operations.
 22. The system ofclaim 13 wherein the tagging at least part of the sub-elementscomprises: wrapping each one of sub-elements with an HTML tag to therebytransform the sub-element into a Document Object Model element.
 23. Themethod of claim 13, further comprising: in response to a change in oneor more display environment characteristics, automatically repeating thecontent rendering process to thereby adapt the content item to fitwithin the respective container.
 24. The system of claim 23, furthercomprising: monitoring display environment characteristics, including atleast size of window assigned for displaying the formatted document,dimensions of window assigned for displaying the formatted document,size of the respective container, and dimensions of the container.
 25. Anon-transitory program storage device readable by a computer, tangiblyembodying computer readable instructions executable by the computer toperform a computer-implemented method of for dynamically adaptingdisplay of content within a container of a formatted document, thecontainer defining a restricted area within the formatted documentdesignated for displaying the content, the method comprising: obtainingdata indicative of sub-elements within at least one content item, the atleast one content item is assigned to be displayed within a respectivecontainer in a formatted document, the sub-elements comprising aplurality of tagged sub-elements; wherein tagging of sub-elementsenables to obtain display parameters of tagged sub-elements; displayingat least part of the tagged sub-elements of the content item in therespective container in the formatted document; determining displayparameters of at least part of the tagged sub-elements; calculating,based on at least the display parameters, whether at least onesub-element overflows from an area designated for displaying content inthe respective container; in case at least one sub-element overflows therespective container: adapting the at least one content item to fit inthe area; and displaying the adapted at least one content item withinthe area of the container in the formatted document.